HTC DESIRE 526 User Manual page 190

190 Sync, backup, and reset
5. Enter the password you've set for this backup, and then tap OK.
Backing up your text messages
Keep important text messages by backing them up to the phone storage. You can easily
restore backed up text messages after you've deleted them from your message list.
Text messages in the secure box and blocked messages will not be backed up.
To include such messages to your backup, move them first to the general
message box.
1. From the Home screen, tap
2. Tap > Back up/Restore SMS > Back up > Back up SMS.
3. To help protect your data, set a password for your backup. Be sure to
remember this password. You'll need to enter it again when restoring
messages.
If you don't need a password, select Do not password protect this backup.
4. Enter a name for your backup file, and then tap OK.
Backing up text messages by email
You need to set up your email account in the Mail app.
1. From the Home screen, tap
2. Tap > Back up/Restore SMS.
, and then find and tap Messages.
, and then find and tap Messages.